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Which property does air acquire on that entry?

  • A.A very high ozone concentration, acquired from the surrounding stratospheric air as it crosses the tropopause
  • B.High humidity
  • C.A large potential vorticity, which it inherits from the strong stratification of the layer it is entering
  • D.Extreme dryness set by the cold point temperature

Answer: D

The tropical cold point acts as a freeze drier, dehydrating the ascending air to the saturation mixing ratio there, which is a few parts per million. This is the Brewer mechanism explaining the extreme dryness of the whole stratosphere. Ozone and potential vorticity are acquired gradually thereafter rather than at the moment of entry.

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